Make a Simple Drawstring Skirt
This is so easy. I'm a beginning seamstress, and I can handle this just fine. This skirt can be made to any length, and to any size. Try using vintage sheets for fabric on this project, especially for teenagers and small children.
Here is another one that I'd like to try. I've made pillowcase dresses for my toddler, but this one is a pillowcase skirt. You do have to be skinny for this project, so this may exclude me. I'll have to see if I can stuff myself into a pillowcase. If not, I'll try this for my daughter when she is older. This one requires only hand sewing.
Here's a good clothes saver for post baby body: How to Put Side Panels in Pants. This could be done with skirts as well.